Swipe Plus Widget - choose 2 layers for swiping

I am doing the Application for customer that will allow to compare aerial imagery of many different years. For example, some people want to see how their house looked in 2015 and 2013, other want to compare 2010 and 1998.

If I choose vertical swipe, Widget has an option to Select the layer I want to appear only to the LEFT of the swipe bar. But I need to choose layers for BOTH: Left and Right sides of the bar.